This is a simple subsystem that allow drivers to register as a backlight.
Each backlight creates a device node under /dev/backlight/backlightX and an alias based on the name provided.
Details
Details
- Reviewers
- None
- Group Reviewers
manpages - Commits
- rS366369: Add backlight subsystem
Diff Detail
Diff Detail
- Repository
- rS FreeBSD src repository - subversion
- Lint
Lint Not Applicable - Unit
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Event Timeline
| share/man/man9/backlight.9 | ||
|---|---|---|
| 48 ↗ | (On Diff #76596) | It could work for not just panels, but also keyboards (e.g. D21746).. That would work much better if we expose metadata, so userspace could tell which of the backlightN is a display and which is a keyboard. |
| sys/sys/backlight.h | ||
| 38 ↗ | (On Diff #76596) | hmm I don't see where that levels[BACKLIGHTMAXLEVELS] field is used.. or how it would be used |
| share/man/man9/backlight.9 | ||
|---|---|---|
| 48 ↗ | (On Diff #76596) | I'm not sure about the metadata yet but for a case like that there is the name used for the dev alias, so you would have a /dev/backlight/keyboard0 or something like that. |
| sys/sys/backlight.h | ||
| 38 ↗ | (On Diff #76596) | See https://reviews.freebsd.org/D26252 |
| share/man/man9/backlight.9 | ||
|---|---|---|
| 48 ↗ | (On Diff #76596) | Aliases are only okay for manual ad-hoc configurations. I'd like to eventually add support for this in the UPower daemon, which would have to enumerate the devs like for (file in /dev/backlight):
metadata = ioctl(give_me_meta, file)
if (metadata & IS_DISPLAY):
new Display(file)
if (metadata & IS_KEYBOARD):
new Keyboard(file)In general anything exposed by the kernel should be enumerable and inspectable, writing userspace software is really frustrating when the kernel isn't being helpful. |
| share/man/man9/backlight.9 | ||
|---|---|---|
| 67 ↗ | (On Diff #77101) | You can drop .Pa from here. |